import java.util.Scanner;

public class Ex2_20{
	public static void main(String[] args){
		Scanner input = new Scanner(System.in);
		System.out.print("Enter x1 and y1: ");
		double x1 = input.nextDouble();
		double y1 = input.nextDouble();
		System.out.print("Enter x2 and y2: ");
		double x2 = input.nextDouble();
		double y2 = input.nextDouble();
		double distance = Math.pow((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1), 0.5);
		System.out.println("The distance of the two points is " + 
			distance);
	}
}

